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Final Practice 1

# Final Practice 1 - iew Attempt...

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View Attempt 1 of 5 Title: Practice Final Started: December 8, 2009 5:08 PM Submitted: December 8, 2009 5:08 PM Time spent: 00:00:24 Total score: 0/34 = 0% Total score adjusted by 0.0 Maximum possible score: 34 1. What is the solubility in moles/liter for calcium fluoride at 25 o C given a K sp value of 4.0 x 10 -11 . Write using scientific notation and use 1 or 2 decimal places (even though this is strictly incorrect!) Student Response Value Correct Answer 1. not answered 0% Equals 2.15e-4 (100%) Equals 2.2e-4 (100%) General Feedback: K sp = 4S 3 Score: 0/1 2. A precipitate of lead(II)chloride forms when 7.0 mg of NaCl is dissolved in 0.250 L of 0.12 M lead(II)nitrate. True or False? K sp of PbCl 2 is 1.7 x 10 -5 . Student Response Value Correct Answer Feedback 1. True 0% 2. False 100% Score: 0/1 3. Which of the following compounds will have a different solubility with a change in pH? Student Response Value Correct Answer Feedback 1. AgI 0% 2. PbCl 2 0% 3. BaCrO 4 100% 4. CuBr 0% 5. Hg 2 I 2 0% View Attempt https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent... 1 of 13 09-Dec-09 11:08 AM

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Score: 0/1 4. Answer this question without using numbers from the book (or anywhere else!) D S for the following reaction is positive. True or false? Cl 2 (g, 10 o C, P = 1 atm) => Cl 2 (g, 100 o C, P = 1 atm) Student Response Value Correct Answer Feedback 1. True 100% 2. False 0% Score: 0/1 5. Given the values of D G f o given below in kJ/mol calculate the value of D G o in kJ for the reaction, 4 NH 3 (g) + 5 O 2 (g) => 4 NO(g) + 6 H 2 O(g) D G f o (NH 3 (g)) = -14.1 D G f o (NO(g)) = 91.8 D G f o (H 2 O(g)) = -239.2 Student Response Value Correct Answer Answer not answered 0% -1,011.6 Score: 0/1 6. The value of D G o for the precipitation reaction, Ca 2+ (aq) + CO 3 2- (aq) <=> CaCO 3 (s) is -48.1 kJ at 298 K. Calculate the value of D G in kJ at 298 K if the concentrations of Ca 2+ (aq) and CO 3 2- (aq) are 2.93 and 4.80, M respectively. View Attempt https://scholar.uh.edu/webct/urw/lc305051878.tp305053160/ViewStudent... 2 of 13 09-Dec-09 11:08 AM
Student Response Value Correct Answer Answer not answered 0% -54.6 Score: 0/1 7. Balance the following equation in basic solution using the lowest possible integers and give the coefficient of water. AlH 4 - (aq) + H 2 CO(s) ® Al 3+ (aq) + CH 3 OH(aq) Student Response Value Correct Answer Feedback 1. 1 0% 2. 3 0% 3. 4 100% 4. 2 0% 5. 0 0% Score: 0/1 8. Calculate the pH when 3.18 g of NaF is added to 88.5 mL of 0.50 M HF. Ignore any changes in volume. The K a value for HF is 3.5 x 10 -4 . Student Response Value Correct Answer Answer not answered 0% 3.69 Score: 0/1 9. Calculate the pH during the titration of 20.00 mL of 0.1000 M CH 3 CH 2 COOH(aq) with 0.1000 M NaOH(aq) after 19.74 mL of the base have been added. K a of propanoic acid = 1.3 x 10 -5 .

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